Inventory Scanner error 021

My 'Custom Scan file' never has worked - and I never cared why.
Below is example of my workstation scan results.
(are you sure this is a problem you need worry about??)

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Scanner(Information) : 024: Initiated scan successfully.;
Scanner(Warning) : 021: Unable to access the Custom Scan file.;
Scanner(Information) : 002: Unable to register in to the DMI Service
Layer.;
Scanner(Information) : 009: Software Scan done using Microsoft Installer
(MSI).;
Storer(Information) : 200: The Storer has updated the database.;
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